I've played this game and i think its grate, but there is some things you need
1. randomly chosen levels for monsters , ive noticed that if you playing alone monsters are the same as you level
2.choicing and upgrading weapon > like when you have level up you got some weapon points, for those you can buy some weapons, which will be given to you every round, and upgrade them
sory about my english

wishes to the game
*-friendly fire allways on
*-more weapons (SNIPER VERY NEEDED!!!)
*-more maps
-vechicles
-comander with radio (let him place some markers)
-group spawn (when you spawning one by one there is no effect ,when theyll spawn as a group its gonna better)